What does the color of these spark plugs tell you?

[panic]

Today I've changed the spark plugs in my griffith 500 (the car sounded short of power...) and they looked like the pic below.

I've never seen this blonde color on my spark plugs, I know they want to tell a ''story'' about the engine, can you understand what they're trying to tell? My opinion: the engine is short of fuel...

Thanks a lot.

[Pupp]

What fuel do you normally use and what oil is in the engine? Any additives?

[Chuffmeister]

It looks like they've rusted. Is there coolant or moisture getting into the cylinder? Any loss of coolant? Has the car been stood for a long time?

[Pupp]

Rust? On the porcelain insulator? Suspect the OP might have been using an octane booster...

[Chuffmeister]

A quick search on the net produced MMT fouling, additives,octane boost etc:

http://www.classictruckshop.com/clubs/earlyburbs/p...

[panic]

Octane booster, they're saying ''octane booster''...and use us more often, the car has been most of the time in the garage for the last year or so...

Thanks a lot!